GMC shares everything mechanical with Chevrolet but charges more for premium trim and interior. The 5.3L/6.2L Active Fuel Management lifter failure affects Sierra, Yukon, and Acadia just as it does Silverado and Tahoe. The 8L90 8-speed transmission shudder hit GMC trucks identically. Sierra 1500 and Sierra HD are otherwise strong workhorses. Acadia and Terrain crossovers have had timing chain and AC compressor issues.
GMC consistently outperforms Chevrolet in J.D. Power's dependability study despite sharing platforms. Consumer Reports rates GMC mid-pack.
Diesel inline-6, no AFM. Best modern GMC truck.
No cylinder deactivation. Hauls and lasts.
New independent rear suspension; 5.3L still has AFM risk but worth considering for the Denali interior.
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Same DOD lifter collapse issue as Silverado.
Timing chain stretch, AC compressor failures, infotainment freezes.
Timing chain, water pump, transfer case.
AFM/DFM lifter collapse, 8L90 8-speed shudder, Acadia/Terrain timing chain, electric power steering motor failure on older Sierra, and Cadillac/GMC infotainment glitches.
Average $744/year per RepairPal. Slightly higher than Chevy due to Denali trim ownership costs. Resale value is the best of GM brands.
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About the same as Chevrolet - mid-pack overall. Avoid AFM-equipped 5.3L V8s for long-term peace of mind.
Mechanically identical. GMC adds Denali trim and better resale value, but the same drivetrain issues apply.
The 5.3L/6.2L V8s use Active Fuel Management cylinder deactivation, which causes lifter collapse and engine damage. Class action ongoing.
Yes, especially with the 3.0L Duramax diesel. The 3.0L has no AFM and excellent fuel economy.
200-300K for a Sierra HD with the 6.6L gas V8 or Duramax diesel. Sierra 1500 with AFM is 150-200K.
Mixed. The drivetrain is the issue (AFM); the rest of the truck holds up well past 200K.